Logout file

So far all of our configurations for our Unix working environment have been…done in either the .bash_profile configuration file, or in .bashrc and that's…typically the two places that you'll locate them, because those are the files…that get read in when you first start a new session and they set things up the way you like.…But there is one other configuration file that I don't want us to forget about,…which is the logout file. That's in bash_logout, and anything that's in there will…get executed whenever we log out of Unix. Let's take a look at how it works.…Let's create a new file. You see I don't have a bash_logout file right now,…So let's do nano .bash_logout and in it let's just put echo "See ya later!",…which is nice and simple.…

That's the command that we get run whenever we log out.…Now on a Mac, let me just show you first of all that there is the file .bash_logout.…Now on a Mac, it's not that useful because if we close this window, if we just…go up here and close it, well then we'll never see that echo statement.…

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Released

4/29/2011

Unix for Mac OS X Users unlocks the powerful capabilities of Unix that underlie Mac OS X, teaching how to use command-line syntax to perform common tasks such as file management, data entry, and text manipulation. The course teaches Unix from the ground up, starting with the basics of the command line and graduating to powerful, advanced tools like grep, sed, and xargs. The course shows how to enter commands in Terminal to create, move, copy, and delete files and folders; change file ownership and permissions; view and stop command and application processes; find and edit data within files; and use command-line shortcuts to speed up workflow. Exercise files accompany the course.

Topics include:

Moving around the file system

Creating and reading files

Copying, moving, renaming, and deleting files and directories

Creating hard links and symbolic links

Understanding user identity, file ownership, and sudo

Setting file permissions with alpha and octal notation

Changing the PATH variable

Using the command history

Directing input and output

Configuring the Unix working environment

Searching and replacing using grep and regular expressions

Manipulating text with tr, sed, and cut

Integrating with the Finder, Spotlight, and AppleScript

Skill Level Beginner

6h 35m

Duration

1,948,442

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Q: The exercise files for the following movies appear to be broken:
07_02_files
07_03_files
07_04_files
07_05_files
08_03_files

Is there something wrong with them?

These exercises include one or more "dot files", whose file names start with a period. These files are normally hidden from view by the Finder. So that they would show up in the Finder, the period has been removed from the file names. Additionally, "_example" has been added at the end of the file name to make it clear that the file will not work as-is.
To make the dot files usable, either:

1) Open the file in a text editor to view its contents. Note that it may not be possible to double-click the file to open it because there is no file extension (such as .txt).
2) Resave the file under a new name (usually by choosing File > Save As), adding a "." to the beginning of the file name and removing "_example" from the end.

OR

1) Copy and rename the file from the Unix command line using the techniques discussed in this course. Rename the file by adding a "." to the start and removing "_example" from the end. Include the "-i" option to prevent overwriting an existing file unexpectedly.
Example: cp -i ~/Desktop/Exercise\ Files/Chapter_07/07_02_files/bashrc_example ~/.bashrc

The instructor uses the UNIX program 'units' to convert 72° Fahrenheit to degrees Celsius. The returned value of 40 is incorrect. The correct result should be 22°C. What's the reason for this discrepancy?

The problem is that units does the 5/9 calculation but does not have the ability to subtract 32. So you'll need to subtract (or add) the 32 degrees yourself.